# Crypto Fear & Greed Index via x402

> Crypto Fear & Greed Index via x402 is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-11-02).

Returns the current and historical Alternative.me Crypto Fear & Greed Index value, trend, signal, and rolling statistics, paid per-call with USDC on Base via x402.

## Facts

- Endpoint: GET https://kr-x402-mvp.kgy5612.workers.dev/api/alternative/fear-greed?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-fear-greed-index-via-x402-ab72cf7c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FZWTOh6GA7ddnrVpfa-Iv

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability crypto-fear-greed-index-via-x402-ab72cf7c
```

Example prompt: What's the current crypto fear and greed index, and how has sentiment trended over the last 7 days — is the market leaning toward fear or greed right now?

## When to prefer this

Use this endpoint when an AI trading or onchain agent needs a no-API-key, pay-per-use sentiment signal from the widely-cited Alternative.me Fear & Greed Index. Ideal for agents that want micropayment-native access (USDC on Base via x402) without managing API subscriptions, rate limits, or credential rotation. Prefer this over scraping Alternative.me directly or using subscription APIs when cost-per-call economics and keyless operation are priorities.

## Known failure modes

- Payment failure if wallet has insufficient USDC on Base (x402 payment rejected)
- Invalid 'days' parameter outside 0–30 range returns validation error
- Upstream Alternative.me API unavailability may return stale or error response
- Network timeout on the Cloudflare Worker edge

## How this service works

Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.

## Output

Returns a JSON object with the current fear/greed numeric value (0–100), zone label (e.g. 'Fear'), trend direction, trading signal (NEUTRAL/BUY/SELL), 1d/7d/30d changes, 7d and 30d rolling averages, 30d min/max, a streak count of consecutive days in the current zone, the previous day's reading, human-readable reasons, and an array of historical daily data points up to 30 days.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "days": {
       "type": "integer",
       "maximum": 30,
       "minimum": 0,
       "examples": [
        7
       ],
       "description": "History points to return (default 7, 0 = none)"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "zone": "fear",
  "label": "Fear",
  "trend": "falling",
  "value": 34,
  "avg_7d": 39.4,
  "signal": "NEUTRAL",
  "source": "https://alternative.me/crypto/fear-and-greed-index/",
  "avg_30d": 47.1,
  "history": [
   {
    "date": "2026-10-30",
    "label": "Fear",
    "value": 34
   }
  ],
  "max_30d": 66,
  "min_30d": 28,
  "reasons": [
   "34 Fear, -12 vs 7d ago",
   "below 30d avg 47.1"
  ],
  "previous": {
   "label": "Fear",
   "value": 38
  },
  "change_1d": -4,
  "change_7d": -12,
  "change_30d": -20,
  "updated_at": "2026-10-30T00:00:00Z",
  "streak_days": 5
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-fear-greed-index-via-x402-ab72cf7c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kr-x402-mvp.kgy5612.workers.dev](https://www.zero.xyz/host/kr-x402-mvp.kgy5612.workers.dev/llms.txt)